By Osburn

Osburn Everest III Wood Fireplace

$6,279.00
$6,279.00
Door overlay: Black
Faceplate: Traditional
Availability: Low stock: 2 left
SKU: OB04017+OA10620+OA10623
Osburn Everest III Wood Fireplace
$6,279.00
$6,279.00

At a glance

  • Type: Wood fireplace, EPA 2020 certified
  • Heats: 750–2,500 sq ft
  • Heat output: 85,000 BTU/hr
  • Log length: 16 in east-west
  • Efficiency: 65% HHV
  • Burn time: Up to 8 hours
  • Chimney: 6 in

Description

The Osburn Everest III Wood Fireplace is an EPA 2020 certified wood fireplace for 750 to 2,500 sq ft. It burns up to 8 hours on a load and takes a 6-inch chimney.

Who it's for

Right buyer. Owners of moderately to well-insulated homes between roughly 1,300 and 2,000 sq ft who want a wood-burning fireplace built into the wall with the heat output and EPA 2020 cordwood compliance of a serious heating appliance, not a decorative-only fireplace.

Replacement is not a drop-in: the old prefab unit must come out completely, the old chimney must be removed or replaced with an approved 6-inch UL 103 HT / ULC S629 system, and the existing chase framing must meet the published framing dimensions and clearances or be rebuilt to meet them.

How it performs

The 85,000 BTU/hr maximum is a peak rating, transient, achieved on dry cordwood at high loading density and short reload intervals. The figure that matters for daily life is the sustained output across a full burn cycle, which lands in the 25,900–78,200 BTU/hr band per the CSA B415.1-10 stack-loss method.

Good to know

  • Two buyer-configurable choices at order.
  • Narrower glass viewing area than smaller siblings.
  • Larger combustible side-wall clearance. 21 inches of combustible side-wall clearance is meaningfully more than the 13 inches required for the Solution 2.5 ZC II.

Specifications

Dimensions

Dimensions from the specification sheet

Measurement Value
Overall height 49‑1/8"
Overall width 41‑7/8"
Overall depth 29"
Shipping weight 525 lb

Dimensions

Measurement Value
Firebox volume 3.04 ft³ overall / 2.61 ft³ EPA
Glass 18 3/4" x 11", ceramic, double door
Minimum chimney height 15 ft
Door opening 20 3/4" W x 9 5/8" H
Overall dimensions 41 7/8" W x 29" D x 49 1/8" H
Shipping weight 525 lb

Where it can go

The Everest III is designed for installation in a permitted residential space — a living room, great room, family room, or any habitable room with adequate floor and wall framing to accept the zero-clearance chase and the 6-inch chimney system. In the US market it is not approved for mobile or manufactured-home installation; in Canada it carries a mobile-home approval per the manufacturer listing.

It is not approved for drop-in replacement of an existing prefab/decorative fireplace (the unit cannot slide into an existing prefab firebox and cannot reuse the old chimney or framing if those do not meet the published requirements), or outdoor or unconditioned-space installation. Replacement installs are possible only when the old fireplace and chimney are fully removed and the chase is verified or rebuilt to meet the required framing dimensions, clearances, and the approved 6-inch UL 103 HT / ULC S629 chimney requirement.

This is a zero-clearance unit — it ships with listed insulation, shielding, and standoffs that allow installation inside a framed combustible chase when the manual's framing dimensions, clearances, air spaces, chimney system, and finish-material requirements are followed. No masonry shell is required, but no surface of the firebox or chimney connection is permitted to touch combustible material outside the manual's listed zones. Garage, shop, cabin, or non-residential installations should be cleared with the AHJ, insurer, and authorized installer before purchase.

Clearances to combustibles

Floor protection

A hearth extension is required if the fireplace is installed directly on the floor or on a raised base of less than 4 inches. The hearth extension must be a continuous non-combustible material extending in front of the fireplace per the install manual's specifications. If the fireplace sits on a raised base of 4 inches or more, the hearth extension requirements may differ — refer to the install manual's hearth-extension section.

Clearances

The 21-inch combustible side-wall clearance is meaningfully larger than the 13-inch side-wall clearance on the Solution 2.5 ZC II and other smaller SBI fireplaces — this fireplace needs more lateral wall framing space. Verify chase width with your installer before committing.

Clearances apply identically in Canada and the USA per the manufacturer's clearance table. The certification label on the unit is the binding clearance for any installation and always overrides clearance figures published in any other media. Some appliances have been tested with a low ceiling — refer to the installation manual for reduced-ceiling configurations. Confirm the binding clearance figures with your installer before purchase.

Documents

Details

Appliance type Zero-clearance wood fireplace
Combustion technology Non-catalytic
Firebox volume 3.04 ft³ overall / 2.61 ft³ EPA
Maximum heat output 85,000 BTU/hr
Tested output range 25,900–78,200 BTU/hr
Heating range 750–2,500 sq ft
Average efficiency 65% HHV
Particulate emissions 1.9 g/hr
Average CO emissions 1.7 g/min per manufacturer spec
Maximum burn time Up to 8 hours
Recommended log length 16 in east-west
Maximum log length 20 in east-west
Construction Steel firebox, retractable cast-iron double doors
Faceplate Configured at order
Door overlay Configured at order
Baffle C-Cast
Glass 18 3/4" x 11", ceramic, double door
Blower 176 CFM, included
Flue connection 6 in
Minimum chimney height 15 ft
Combustion chamber 18 3/4" W x 17" D x 16 7/8" H
Door opening 20 3/4" W x 9 5/8" H
Overall dimensions 41 7/8" W x 29" D x 49 1/8" H
Shipping weight 525 lb
Mobile home approved Canada only
Standards UL 127 / ULC-S610, EPA / CSA B415.1‑10
Country of origin Made in Canada
Model OB04017
Manufacturer Osburn, by Stove Builder International (SBI), Quebec, Canada
Certification UL 127, ULC S610; EPA 2020
Warranty Limited lifetime
Specification source Osburn dealers (blazingembers.com) and the Ray Murray 2025‑26 hearth catalog, 2026

Warranty

A one-time replacement limit applies to all parts with lifetime coverage. Warranty is void if the unit is used to burn anything other than seasoned cordwood, or if it is not operated according to the owner's manual. Damage caused by misuse, improper installation, lack of maintenance, overfiring, downdrafts, venting problems, or under-estimated heating area is not covered. Improper installation by anyone other than an authorized qualified technician voids the warranty.

Warranty claims are made through your Osburn dealer and remain subject to SBI/Osburn inspection, approval, and the current written warranty. Kaminos is the retailer for this fireplace and supports buyers through purchase; final warranty approval rests with SBI as the manufacturer. SBI's parts network is well-stocked — replacement bricks, baffle, secondary tubes, glass, gaskets, blower, faceplate, door overlay, and venting components are openly available at fair prices through multiple parts vendors.

Osburn may require photos or returned parts to support a claim; repair work covered by warranty requires prior manufacturer approval.

Coverage details can change by component and warranty revision; the current Osburn warranty controls.

Heat

From the specification sheet
Spec Value
Firebox volume 3.0 cu ft
Blower included
Spec Value What it means
Combustion technology Non-catalytic Secondary-air tubes reignite smoke gases. No catalyst to replace; simpler operation than a cat appliance but shorter low-and-slow burn times.
Maximum heat output 85,000 BTU/hr Peak output on dry cordwood, transient. Sustained output across a burn cycle is substantially lower.
Heating range 750–2,500 sq ft Manufacturer's stated range. Real-world comfort sizing for primary heat is roughly 1,300–2,000 sq ft in moderate climates and lower in cold climates or older homes — depends on insulation, layout, climate, ceiling height, fuel quality, and installation.
Average efficiency 65% HHV 71.6% optimum overall efficiency at low burn rate; 68% optimum heat-transfer efficiency. Slightly higher average than the smaller Stratford II / Solution 2.5 ZC II (64% HHV). HHV is the federal standard.
Particulate emissions 1.9 g/hr EPA 2020 cordwood certified (limit is 2.5 g/hr) — below the ceiling. Tested by an independent accredited laboratory.
Average CO emissions 1.7 g/min per manufacturer spec Carbon monoxide emissions per CSA B415.1‑10 stack-loss method. Manufacturer's published unit is g/min on this model; most SBI wood appliances publish CO in g/hr. Read as ~102 g/hr if comparing to the g/hr figures on other appliances. Verify the unit with the dealer or installer if the comparison matters to your purchase decision.
Maximum burn time Up to 8 hours Manufacturer maximum from a packed load of dry hardwood with the air shut down hard. Useful heat through a burn cycle is realistically 6–7 hours.
Recommended log length 16 in east-west Per manual. Most firewood suppliers cut to this length.
Maximum log length 20 in east-west Longer logs go east-west across the width. The 17-inch firebox depth also accepts north-south loading for packed overnight cycles.
Combustion chamber 18 3/4" W x 17" D x 16 7/8" H Inside firebox dimensions per manufacturer spec. The 17-inch depth accepts loading over both width (east-west) and depth (north-south) — useful for packed overnight cycles.

Choices and prices

Options

The unit price is Osburn's 2026 list price for the wood fireplace alone. Options sold on this page add to it; those marked on request we add to your order by hand.

Door overlay
Door overlay Part Price
BLACK DOOR OVERLAY OA10620 $165
BRUSHED NICKEL DOOR OVERLAY OA10622 $440
FIRESCREEN DOOR (on request) AC01226 $189
Faceplate and trim
Faceplate and trim Part Price
MODERN FACEPLATE OA10621 $770
TRADITIONAL FACEPLATE OA10623 $715
Fresh air
Fresh air Part Price
4''Ø FRESH AIR INTAKE REGISTER WITH AIRTIGHT DAMPER (on request) AC01347 $280
4''Ø X 10' INSULATED FLEX PIPE FOR FRESH AIR INTAKE (on request) AC02091 $75
Other options
Other options Part Price
6"Ø X 25' INSULATED FLEX PIPE FOR FORCED AIR KIT (on request) AC01350 $225
TRADITIONAL GRAVITY KIT (on request) AC01375 $440
SEMI-TRANSPARENT BLACK GLASS WITH NIGHTFLAME EFFECT (SET OF 2) (on request) AC02776 $529
FIREPLACE CARRYING HANDLES (on request) AC09200 $100

What arrives

  • Everest III zero-clearance fireplace with welded steel firebox, retractable cast-iron double doors, moulded refractory brick lining, stainless-steel secondary-air system, and listed insulation, shielding, and standoffs that allow installation inside a framed combustible chase per the manual's required clearances, framing dimensions, air spaces, and finish-material zones
  • Configured at order with required faceplate selection — Traditional Faceplate (default) or Modern Faceplate (upgrade)
  • Configured at order with required door overlay selection — Black Door Overlay (default) or Brushed Nickel Door Overlay (upgrade)
  • 176 CFM blower with rheostat speed control
  • C-Cast baffle
  • Owner's installation and operation manual and product documentation
Sold separately
  • Code-compliant 6-inch Class A insulated chimney system — listed factory-built chimney from an approved manufacturer/brand per the manufacturer's approved-chimney list; required venting components are sold separately
  • Hearth extension or floor protection sized to manual specifications, with continuous non-combustible material in front of the fireplace
  • Optional Forced Air Kit (SBI VA4460) — distributes heat to a remote room via insulated ducting; includes 6" × 25' insulated flex pipe (SBI AC01350); use only manufacturer-supplied components
  • Optional Firescreen Door (SBI AC01226) — for occasional attended fire viewing only with the retractable doors open, where permitted by local code and only when used exactly as instructed in the firescreen manual; never leave the fireplace unattended when used with a firescreen. Open-door operation with a firescreen is prohibited in the United States and in Canadian provinces with particulate emission limits
  • Optional NightFlame Semi-Transparent Black Glass set of 2 (SBI AC02776) — ROBAX® ceramic glass upgrade that conceals the firebox interior when the fire is out and reveals the flames when burning
  • Optional Traditional Gravity Kit (SBI AC01375) — for installations where finish material extends to the edge of the door without visible louvers, traditional style
  • Optional 4-inch fresh-air intake register with airtight damper (SBI AC01347) — closable outside-air damper for tight homes or where local code requires it; do not close while the fireplace is in use
  • Optional 4-inch × 10' insulated flex pipe for fresh air intake (SBI AC02091)
  • Optional Fireplace Carrying Handles (SBI AC09200) — site handling aid during installation; not part of the finished assembly
  • Digital moisture reader and probe thermometer — strongly recommended; not optional in practice
  • Installation by an authorized qualified technician (WETT, NFI, or CSIA certified) and a framing contractor familiar with zero-clearance fireplace chase construction — required for warranty coverage and often required by code, permit, or insurance

Installation

Chimney requirements from the specification sheet

Requirement Value
Flue 6 in
Chimney type factory-built chimney per the manual

A 6-inch chimney flue system is required. New factory-built chimney systems must comply with UL 103 HT (USA) or ULC S629 (Canada) and be suitable for solid fuel. Approved manufacturer/brand combinations listed by SBI include American Metal HSS and HS, DuraVent Dura Tech / Dura Tech Premium / Dura Plus HTC / Dura Plus, Metal Fab Temp Guard, Olympia Champion and Rockford, Ventis (Olympia/SBI Venting Division), Nexvent (SBI Venting Division), Security Chimney ASHT and S-2100, and Selkirk Ultimate Plus / CF Sentinel / Super Pro 2100 / Super Vent 2100. Verify the chimney brand and component series with your installer before ordering venting.

The minimum chimney height is 15 feet, subject to installer verification, certification label, draft conditions, and local code. The chimney must extend at least 3 feet above the highest point of contact with the roof and at least 2 feet above any roof line or obstacle within 10 feet horizontally.

Outside air

Outside air is not required in conventional homes — combustion air is normally available from room air. However, the optional fresh-air intake register (SBI AC01347, 4-inch) and 4-inch × 10-foot insulated flex pipe (SBI AC02091) are strongly recommended for tight new-construction homes with mechanical ventilation, for homes with powerful range hoods or other mechanical exhaust appliances, and where local code requires it. A smoke detector and carbon monoxide detector are required in the room where the fireplace is installed.

Codes and approvals

Code compliance for any specific installation is determined by the local Authority Having Jurisdiction. Manufacturer listings cover what the fireplace is approved for; the AHJ approves what is permitted at your address. A WETT (Canada), NFI, or CSIA (USA) certified installer is strongly recommended and frequently required by code, permit, or insurance. Zero-clearance wood-burning fireplaces are a regulated category — confirm local requirements before purchasing, particularly in EPA non-attainment counties and in HOA jurisdictions where new wood-burning installs may be restricted.

California Proposition 65

This product can expose you to chemicals including carbon monoxide, which is known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to www.P65warnings.ca.gov.

Planning the install

  • Check with your building department and insurer: wood appliances need a permit in most places and an inspection after installation.
  • The chimney is the other half of the system. It is sold separately and quoted from your installer's plan.
  • Clearances and floor protection come from the manual and depend on the pipe and shields you choose. Send us your plan and we will check it.
  • Burn seasoned wood below 20 percent moisture. Wet wood is the cause of most complaints about any wood stove.
  • Special-order goods ship by freight.

Questions
How does it compare with the other Osburn models?
  • Osburn Stratford II Smaller sibling in the Osburn wood fireplace line — 2.5 ft³ overall firebox volume, 1.94 ft³ EPA loading volume, 80,000 BTU/hr maximum output, 12,700–60,700 BTU/hr tested band, 64% HHV / 68% LHV efficiency, 70% optimum overall and 68% optimum heat-transfer, 1.2 g/hr particulate emissions (lower than Everest III's 1.9), 98 g/hr average CO, 8-hour max burn, 20-inch log capacity, 176 CFM included blower, 6-inch chimney, 15-foot minimum chimney height, UL 127 / ULC-S610 safety standards, EPA 2020 cordwood certified, not mobile-home approved. Sealed double-door design without retractable architecture — pure closed-combustion configuration. Larger 22 1/4" × 12 1/2" glass than Everest III's 18 3/4" × 11", smaller overall footprint, 468 lb shipping weight, configurable Traditional/Modern faceplate with required Black/Brushed Nickel door overlay. Choose the Stratford II for lower emissions, larger glass area, smaller chase footprint, and a straightforward sealed-door fireplace; choose the Everest III for the larger firebox, slightly higher average efficiency, the retractable cast-iron door architecture, and the NightFlame glass upgrade option.
  • Osburn Horizon Larger sibling in the Osburn wood fireplace line — 4.28 ft³ firebox, 95,000 BTU/hr maximum output, 1,000–2,800 sq ft heating range, 25-inch log capacity, 11-hour maximum burn, 8-inch chimney (vs Everest III's 6-inch). Same 176 CFM included blower, same architectural integration (zero-clearance fireplace built into a framed chase), same EPA 2020 certification category. Sealed double-door design, no retractable architecture. Choose the Everest III for smaller homes, the retractable cast-iron door architecture, the 6-inch chimney's lower install cost, two configurable design choices at order, and the NightFlame glass option; choose the Horizon for the bigger firebox, 25-inch logs, longer 11-hour burn, primary heat across larger spaces up to 2,800 sq ft, and the wider 29 3/4" × 13 1/2" glass area.
  • Pacific Energy FP25 LE Premium cross-brand competitor in the EPA-certified zero-clearance wood fireplace category, built by Pacific Energy in British Columbia. 2.1 ft³ firebox (smaller than 3.04), 67% HHV efficiency, 1.4 g/hr emissions, 18-inch maximum log capacity, two 80 CFM temperature-actuated blowers, cast-iron door, mobile-home approved (including in the US, where Everest III is Canada-only), 610 lb shipping weight, EPA 2020 certified with catalytic-free Extended Burn Technology (EBT) and a heavy-gauge steel floating firebox. No retractable-door architecture; standard sealed-door design. Choose the Pacific Energy FP25 LE for US mobile-home compatibility, slightly lower emissions, and the Pacific Energy floating-firebox build philosophy; choose the Everest III for the larger 3.04 ft³ firebox, 20-inch log capacity vs 18-inch, retractable cast-iron door architecture, two configurable design choices, and the NightFlame glass option. Enerzone Solution 2.5 ZC II SBI sister-brand counterpart in the smaller medium fireplace class — 2.5 ft³ overall firebox volume, 1.94 ft³ EPA loading volume, 80,000 BTU/hr maximum output, 1.2 g/hr particulate emissions (lower than Everest III's 1.9), 98 g/hr average CO, 8-hour max burn, 20-inch log capacity, 176 CFM included blower, 6-inch chimney, 22 1/4" × 13 1/2" glass (larger than Everest III's 18 3/4" × 11"), included cast-iron andirons, sealed double-door design, not mobile-home approved. One buyer-configurable choice (louver style) versus the Everest III's two. Choose the Solution 2.5 ZC II for lower emissions, larger glass, included andirons, simpler at-order configuration, and the Enerzone brand finish; choose the Everest III for the larger 3.04 ft³ firebox, retractable cast-iron door architecture, configurable faceplate and door overlay, and the optional NightFlame glass upgrade.
What chimney does it take?

A 6-inch flue: a listed factory-built chimney rated UL 103 HT in the US or ULC S629 in Canada, or a lined masonry chimney in good repair. The connector pipe and chimney are quoted from your installer's plan.

Does it need a blower?

No. Every Osburn heats by radiation and natural convection. The optional blower moves warm air into the room faster and helps in a larger or open space; it needs a 120-volt outlet.

Can I install it myself?

Many owners do the placement and the pipe with the manual in hand, but the chimney, the permit and the inspection are where an installer earns the fee. Insurance usually requires the inspection.

Can I return it?

Stoves ship by freight. Confirm the model and the options with us before you order, and contact us before returning anything.

What wood should I burn?

Seasoned hardwood, split and dried a year or more, below 20 percent moisture. Wet wood smokes, coats the chimney with creosote and makes a poor fire.

If you have any questions about this product, please let us know by filling out the form below, and we will contact you as soon as possible.